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/*
* arch/mips/mm/init.c
*
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
* Ported to MIPS by Ralf Baechle
*/
#include <linux/config.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/head.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#ifdef CONFIG_BLK_DEV_INITRD
#include <linux/blk.h>
#endif
#include <asm/bootinfo.h>
#include <asm/cachectl.h>
#include <asm/dma.h>
#include <asm/jazzdma.h>
#include <asm/vector.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#ifdef CONFIG_SGI
#include <asm/sgialib.h>
#endif
extern void deskstation_tyne_dma_init(void);
extern void show_net_buffers(void);
const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
asmlinkage int sys_cacheflush(void *addr, int bytes, int cache)
{
/* XXX Just get it working for now... */
flush_cache_all();
return 0;
}
/*
* BAD_PAGE is the page that is used for page faults when linux
* is out-of-memory. Older versions of linux just did a
* do_exit(), but using this instead means there is less risk
* for a process dying in kernel mode, possibly leaving a inode
* unused etc..
*
* BAD_PAGETABLE is the accompanying page-table: it is initialized
* to point to BAD_PAGE entries.
*
* ZERO_PAGE is a special page that is used for zero-initialized
* data and COW.
*/
pte_t * __bad_pagetable(void)
{
extern char empty_bad_page_table[PAGE_SIZE];
unsigned long page;
unsigned long dummy1, dummy2;
#if (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4)
unsigned long dummy3;
#endif
page = (unsigned long) empty_bad_page_table;
/*
* As long as we only save the low 32 bit of the 64 bit wide
* R4000 registers on interrupt we cannot use 64 bit memory accesses
* to the main memory.
*/
#if (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4)
/*
* Use 64bit code even for Linux/MIPS 32bit on R4000
*/
__asm__ __volatile__(
".set\tnoreorder\n"
".set\tnoat\n\t"
".set\tmips3\n\t"
"dsll32\t$1,%2,0\n\t"
"dsrl32\t%2,$1,0\n\t"
"or\t%2,$1\n"
"1:\tsd\t%2,(%0)\n\t"
"subu\t%1,1\n\t"
"bnez\t%1,1b\n\t"
"addiu\t%0,8\n\t"
".set\tmips0\n\t"
".set\tat\n"
".set\treorder"
:"=r" (dummy1),
"=r" (dummy2),
"=r" (dummy3)
:"0" (page),
"1" (PAGE_SIZE/8),
"2" (pte_val(BAD_PAGE)));
#else /* (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) */
__asm__ __volatile__(
".set\tnoreorder\n"
"1:\tsw\t%2,(%0)\n\t"
"subu\t%1,1\n\t"
"bnez\t%1,1b\n\t"
"addiu\t%0,4\n\t"
".set\treorder"
:"=r" (dummy1),
"=r" (dummy2)
:"r" (pte_val(BAD_PAGE)),
"0" (page),
"1" (PAGE_SIZE/4));
#endif
return (pte_t *)page;
}
static inline void
__zeropage(unsigned long page)
{
unsigned long dummy1, dummy2;
#if (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4)
/*
* Use 64bit code even for Linux/MIPS 32bit on R4000
*/
__asm__ __volatile__(
".set\tnoreorder\n"
".set\tnoat\n\t"
".set\tmips3\n"
"1:\tsd\t$0,(%0)\n\t"
"subu\t%1,1\n\t"
"bnez\t%1,1b\n\t"
"addiu\t%0,8\n\t"
".set\tmips0\n\t"
".set\tat\n"
".set\treorder"
:"=r" (dummy1),
"=r" (dummy2)
:"0" (page),
"1" (PAGE_SIZE/8));
#else /* (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) */
__asm__ __volatile__(
".set\tnoreorder\n"
"1:\tsw\t$0,(%0)\n\t"
"subu\t%1,1\n\t"
"bnez\t%1,1b\n\t"
"addiu\t%0,4\n\t"
".set\treorder"
:"=r" (dummy1),
"=r" (dummy2)
:"0" (page),
"1" (PAGE_SIZE/4));
#endif
}
static inline void
zeropage(unsigned long page)
{
flush_page_to_ram(page);
__zeropage(page);
}
pte_t __bad_page(void)
{
extern char empty_bad_page[PAGE_SIZE];
unsigned long page = (unsigned long)empty_bad_page;
zeropage(page);
return pte_mkdirty(mk_pte(page, PAGE_SHARED));
}
void show_mem(void)
{
int i, free = 0, total = 0, reserved = 0;
int shared = 0;
printk("Mem-info:\n");
show_free_areas();
printk("Free swap: %6dkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
i = max_mapnr;
while (i-- > 0) {
total++;
if (PageReserved(mem_map+i))
reserved++;
else if (!atomic_read(&mem_map[i].count))
free++;
else
shared += atomic_read(&mem_map[i].count) - 1;
}
printk("%d pages of RAM\n", total);
printk("%d free pages\n", free);
printk("%d reserved pages\n", reserved);
printk("%d pages shared\n", shared);
show_buffers();
#ifdef CONFIG_NET
show_net_buffers();
#endif
}
extern unsigned long free_area_init(unsigned long, unsigned long);
unsigned long paging_init(unsigned long start_mem, unsigned long end_mem)
{
pgd_init((unsigned long)swapper_pg_dir);
return free_area_init(start_mem, end_mem);
}
void mem_init(unsigned long start_mem, unsigned long end_mem)
{
int codepages = 0;
int datapages = 0;
unsigned long tmp;
extern int _etext, _ftext;
#ifdef CONFIG_MIPS_JAZZ
if (mips_machgroup == MACH_GROUP_JAZZ)
start_mem = vdma_init(start_mem, end_mem);
#endif
end_mem &= PAGE_MASK;
max_mapnr = num_physpages = MAP_NR(end_mem);
high_memory = (void *)end_mem;
/* clear the zero-page */
memset(empty_zero_page, 0, PAGE_SIZE);
/* mark usable pages in the mem_map[] */
start_mem = PAGE_ALIGN(start_mem);
for(tmp = MAP_NR(start_mem);tmp < max_mapnr;tmp++)
clear_bit(PG_reserved, &mem_map[tmp].flags);
#ifdef CONFIG_SGI
prom_fixup_mem_map(start_mem, (unsigned long)high_memory);
#endif
for (tmp = PAGE_OFFSET; tmp < end_mem; tmp += PAGE_SIZE) {
/*
* This is only for PC-style DMA. The onboard DMA
* of Jazz and Tyne machines is completly different and
* not handled via a flag in mem_map_t.
*/
if (tmp >= MAX_DMA_ADDRESS)
clear_bit(PG_DMA, &mem_map[MAP_NR(tmp)].flags);
if (PageReserved(mem_map+MAP_NR(tmp))) {
if ((tmp < (unsigned long) &_etext) &&
(tmp >= (unsigned long) &_ftext))
codepages++;
else if ((tmp < start_mem) &&
(tmp > (unsigned long) &_etext))
datapages++;
continue;
}
atomic_set(&mem_map[MAP_NR(tmp)].count, 1);
#ifdef CONFIG_BLK_DEV_INITRD
if (!initrd_start || (tmp < initrd_start || tmp >=
initrd_end))
#endif
free_page(tmp);
}
tmp = nr_free_pages << PAGE_SHIFT;
printk("Memory: %luk/%luk available (%dk kernel code, %dk data)\n",
tmp >> 10,
max_mapnr << (PAGE_SHIFT-10),
codepages << (PAGE_SHIFT-10),
datapages << (PAGE_SHIFT-10));
return;
}
void free_initmem(void)
{
/* To be written */
}
void si_meminfo(struct sysinfo *val)
{
int i;
i = MAP_NR(high_memory);
val->totalram = 0;
val->sharedram = 0;
val->freeram = nr_free_pages << PAGE_SHIFT;
val->bufferram = buffermem;
while (i-- > 0) {
if (PageReserved(mem_map+i))
continue;
val->totalram++;
if (!atomic_read(&mem_map[i].count))
continue;
val->sharedram += atomic_read(&mem_map[i].count) - 1;
}
val->totalram <<= PAGE_SHIFT;
val->sharedram <<= PAGE_SHIFT;
return;
}
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